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Analysis

  • max time kernel
    147s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240412-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240412-enlocale:en-usos:windows10-2004-x64system
  • submitted
    25/04/2024, 04:20

General

  • Target

    2024-04-25_86a2089f6fe1947051453c55fdc3e99c_bkransomware.exe

  • Size

    71KB

  • MD5

    86a2089f6fe1947051453c55fdc3e99c

  • SHA1

    129ffd88c09da22faf46e572936e402f9c7ee22c

  • SHA256

    fcdee2cf79eaf19e606c077ea5f5b3244976f8d595a5650da18448fa05a78e02

  • SHA512

    9fefdea9157186d25315ea0a2f22c7ef691bddf3a04b6e71102c07175e82f4d0436c848e98d03eb77002a2c72d1a026306fbb62aaa80db60a23b3820f1b4a0cb

  • SSDEEP

    1536:Fc897UsWjcd9w+AyabjDbxE+MwmvlDuazTp:ZhpAyazIlyazTp

Malware Config

Signatures

  • Executes dropped EXE 1 IoCs
  • Reads user/profile data of web browsers 2 TTPs

    Infostealers often target stored browser data, which can include saved credentials etc.

  • Adds Run key to start application 2 TTPs 2 IoCs
  • Drops file in Windows directory 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 3 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\2024-04-25_86a2089f6fe1947051453c55fdc3e99c_bkransomware.exe
    "C:\Users\Admin\AppData\Local\Temp\2024-04-25_86a2089f6fe1947051453c55fdc3e99c_bkransomware.exe"
    1⤵
    • Adds Run key to start application
    • Drops file in Windows directory
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:4460
    • C:\Windows\CTS.exe
      "C:\Windows\CTS.exe"
      2⤵
      • Executes dropped EXE
      • Adds Run key to start application
      • Drops file in Windows directory
      • Suspicious use of AdjustPrivilegeToken
      PID:4500

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

  • C:\Users\Admin\AppData\Local\Microsoft\Office\16.0\excel.exe_Rules.xml

    Filesize

    395KB

    MD5

    fd7bcd736c2e766427c241f571afa8c7

    SHA1

    ab00e8cabd340812f2620f3048a57f75f4363684

    SHA256

    29e68beddf6d79081ea76b1c0a4086efa52859ca6ed7a32352b360d8c7fee3ef

    SHA512

    e6742fb08c157756e78d57a34fafc54a1c61011f8facc0686f880ce820c0e0e7d01afab502e7d52006feea8ff65a610809eaf91bb71ac17587d8785e14ea55c4

  • C:\Users\Admin\AppData\Local\Temp\c34aMUZrihqgnG7.exe

    Filesize

    71KB

    MD5

    28e5e47ecaee8463aa317a9c72ed01e3

    SHA1

    e952707ad6a24b014bd0249c341144b33df095de

    SHA256

    fd3ce1793f316cfe3412488891923e827fc557e4b583c796f575b8f9ab383b70

    SHA512

    3c6db1991266963baccce9f891416ff0ac8c21353678950ff5ceb0961ce22242f4645b8576b6ad7bfa9d8a212b9248c6913314633a6fe59271b7b8f0473ee6b8

  • C:\Windows\CTS.exe

    Filesize

    71KB

    MD5

    66df4ffab62e674af2e75b163563fc0b

    SHA1

    dec8a197312e41eeb3cfef01cb2a443f0205cd6e

    SHA256

    075a6eecd8da1795532318f9cf880efe42461f9464d63f74deb271d33110f163

    SHA512

    1588dd78e6e8972013c40cdb6acfb84c8df7b081197233ce621904b645356c805d0424bb93dd46c55834dc47d9ff39ee1323cf8e670841b3fff24ab98ba87f25